1. Which warm ocean current raises the temperature near the eastern coast of North America and the West Coast of Europe?
- Labrador
- Canary
- Gulf Stream
- Benguela
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Answer: Gulf Stream
The Gulf Stream is a warm ocean current that raises the temperature near the eastern coast of North America and the West Coast of Europe.
2. Which zone of ocean water does not receive adequate sunrays?
- Photic
- Euphotic
- Aphotic
- Surface
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Answer: Aphotic
The Aphotic zone extends from 200 meters to the ocean bottom and does not receive adequate sunlight. The Photic or euphotic zone, on the other hand, extends from the upper surface to around 200 meters and receives adequate solar insolation.
3. Which among the following seas does not record high bottom temperature?
- Mediterranean Sea
- Arabian Sea
- Sargasso Sea
- Red Sea
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Answer: Arabian Sea
The enclosed seas in both lower and higher latitudes record higher temperatures at the bottom. Enclosed seas of low latitudes like the Sargasso Sea, the Red Sea, and the Mediterranean Sea have high bottom temperatures due to high insolation throughout the year and lesser mixing of warm and cold waters. However, the Arabian Sea is an open sea and does not record high bottom temperatures.
4. Which among the following statements is correct about isothermal lines?
- They join places of equal atmospheric pressure
- They join places of equal salinity
- They join places of equal temperature
- They join places of equal length
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Answer: They join places of equal temperature
Isothermal lines are lines that join places of equal temperature. They are used to represent the horizontal temperature distribution in various regions.
5. Which among the following statements is/are correct about ocean temperature?
- The maximum temperature of the oceans is always at the thermocline.
- Aphotic zone extends from 200 meters depth to the bottom and does not receive solar rays.
- Both A and B
- None
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Answer: Both A and B
Option A is correct. The maximum temperature of the oceans is usually recorded at the thermocline, which is the layer where there is a rapid change in temperature with depth.
Option B is also correct. The aphotic zone is the portion of the ocean where sunlight does not penetrate, and it extends from around 200 meters depth to the ocean floor.
6. Which among the following statements is not correct about the Deep Zone of the ocean water?
- This zone lies below 1000 meters in the mid-latitudes.
- The temperature in this zone remains constant.
- It contains about 18 percent of the total volume of water in the ocean.
- The ocean bottom always has a temperature that is one or two degrees Celsius above the freezing point.
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Answer: It contains about 18 percent of the total volume of water in the ocean.
Option C is not correct. The Deep Zone contains about 80 percent of the total volume of water in the ocean, not 18 percent.
7. Which among the following zone contains about 80 percent of the total volume of water in the ocean?
- Photic zone
- Euphotic zone
- Deep zone
- Thermocline zone
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Answer: Deep zone
The Deep Zone lies below 1000 meters in the mid-latitudes. It contains about 80 percent of the total volume of water in the ocean. The temperature in this zone remains constant.
8. What is the surface zone of the ocean water called?
- Pelagic zone
- Aphotic zone
- Thermohaline zone
- Photic zone
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Answer: Photic zone
The surface zone of the ocean water is also called the Photic zone or the Euphotic Zone. It is the upper layer of the ocean where the temperature and salinity are relatively constant.
9. Which among the following statements is not correct about ocean temperature?
- The uppermost 10 percent of the oceans contain more heat than the entire atmosphere.
- The temperature of the oceans is always uniform.
- The density of ocean water is mostly a function of its temperature and salinity.
- The oceans of the northern hemisphere are warmer than that of the southern hemisphere.
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Answer: The temperature of the oceans is always uniform.
Option B is not correct. The temperature of the oceans is not uniform; it differs from latitude to latitude and from the surface to the bottom.
10. Which among the following is not a major determinant of Ocean temperature?
- Latitude
- Revolution of the earth
- Density of water
- Ocean currents
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Answer: Revolution of the earth
Revolution of the earth is not a major determinant of ocean temperature. The other options (Latitude, Density of water, Ocean currents) are indeed important factors affecting ocean temperature.
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